SEO: Provide redirect for new users (#3786)

src/components/left/main/LeftMainHeader.tsx

@@ -20,6 +20,7 @@ import {
   IS_ELECTRON,
   IS_TEST,
   PRODUCTION_HOSTNAME,
+  WEB_VERSION_BASE,
 } from '../../../config';
 import {
   INITIAL_PERFORMANCE_STATE_MAX,
@@ -37,8 +38,7 @@ import buildClassName from '../../../util/buildClassName';
 import captureEscKeyListener from '../../../util/captureEscKeyListener';
 import { formatDateToString } from '../../../util/dateFormat';
 import { getPromptInstall } from '../../../util/installPrompt';
-import { setPermanentWebVersion } from '../../../util/permanentWebVersion';
-import { clearWebsync } from '../../../util/websync';
+import { switchPermanentWebVersion } from '../../../util/permanentWebVersion';
 import { IS_APP, IS_MAC_OS } from '../../../util/windowEnvironment';
 
 import useAppLayout from '../../../hooks/useAppLayout';
@@ -99,7 +99,6 @@ type StateProps =
 
 const CLEAR_DATE_SEARCH_PARAM = { date: undefined };
 const CLEAR_CHAT_SEARCH_PARAM = { id: undefined };
-const WEBK_VERSION_URL = 'https://web.telegram.org/k/';
 
 const LeftMainHeader: FC<OwnProps & StateProps> = ({
   shouldHideSearch,
@@ -140,7 +139,6 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
     openChatByUsername,
     lockScreen,
     requestNextSettingsScreen,
-    skipLockOnUnload,
     openUrl,
     updatePerformanceSettings,
   } = getActions();
@@ -252,9 +250,7 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
   });
 
   const handleSwitchToWebK = useLastCallback(() => {
-    setPermanentWebVersion('K');
-    clearWebsync();
-    skipLockOnUnload();
+    switchPermanentWebVersion('K');
   });
 
   const handleOpenTipsChat = useLastCallback(() => {
@@ -378,7 +374,7 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
         <MenuItem
           icon="K"
           isCharIcon
-          href={WEBK_VERSION_URL}
+          href={`${WEB_VERSION_BASE}k`}
           onClick={handleSwitchToWebK}
         >
           Switch to K Version
@@ -394,9 +390,8 @@ const LeftMainHeader: FC<OwnProps & StateProps> = ({
       )}
     </>
   ), [
-    animationLevelValue, archivedUnreadChatsCount, canInstall, handleAnimationLevelChange, handleBugReportClick, lang,
-    handleChangelogClick, handleDarkModeToggle, handleOpenTipsChat, handleSelectSaved, handleSwitchToWebK,
-    onSelectArchived, onSelectContacts, onSelectSettings, theme, withOtherVersions, archiveSettings,
+    animationLevelValue, archiveSettings.isHidden, archivedUnreadChatsCount, canInstall, lang, onSelectArchived,
+    onSelectContacts, onSelectSettings, theme, withOtherVersions,
   ]);
 
   const searchContent = useMemo(() => {

src/config.ts

@@ -6,6 +6,7 @@ export const RELEASE_DATETIME = process.env.RELEASE_DATETIME;
 
 export const PRODUCTION_HOSTNAME = 'web.telegram.org';
 export const PRODUCTION_URL = 'https://web.telegram.org/a';
+export const WEB_VERSION_BASE = 'https://web.telegram.org/'; // Used to redirect to other versions
 
 export const IS_MOCKED_CLIENT = process.env.APP_MOCKED_CLIENT === '1';
 export const IS_TEST = process.env.APP_ENV === 'test';

src/index.tsx

@@ -15,6 +15,7 @@ import { enableStrict, requestMutation } from './lib/fasterdom/fasterdom';
 import { selectTabState } from './global/selectors';
 import { establishMultitabRole, subscribeToMasterChange } from './util/establishMultitabRole';
 import { requestGlobal, subscribeToMultitabBroadcastChannel } from './util/multitab';
+import { checkAndAssignPermanentWebVersion } from './util/permanentWebVersion';
 import { onBeforeUnload } from './util/schedulers';
 import updateWebmanifest from './util/updateWebmanifest';
 import { IS_MULTITAB_SUPPORTED } from './util/windowEnvironment';
@@ -37,6 +38,8 @@ async function init() {
 
   if (!(window as any).isCompatTestPassed) return;
 
+  checkAndAssignPermanentWebVersion();
+
   if (IS_MULTITAB_SUPPORTED) {
     subscribeToMultitabBroadcastChannel();
 

src/lib/gramjs/client/downloadFile.ts

@@ -1,5 +1,7 @@
 import BigInt from 'big-integer';
 
+import type TelegramClient from './TelegramClient';
+
 import Deferred from '../../../util/Deferred';
 import { Foreman } from '../../../util/foreman';
 import errors from '../errors';
@@ -7,7 +9,6 @@ import Api from '../tl/api';
 
 import { sleep } from '../Helpers';
 import { getDownloadPartSize } from '../Utils';
-import type TelegramClient from './TelegramClient';
 
 interface OnProgress {
     isCanceled?: boolean;

src/util/permanentWebVersion.ts

@@ -1,7 +1,57 @@
+import { getActions } from '../global';
+
+import { PRODUCTION_HOSTNAME, WEB_VERSION_BASE } from '../config';
+import { clearWebsync } from './websync';
+
+const SEARCH_ENGINE_REFERRERS = ['google', 'bing', 'duckduckgo', 'ya', 'yandex'];
 // Handled by the legacy version. Cannot be updated
 const PERMANENT_VERSION_KEY = 'kz_version';
 const AVAILABLE_VERSIONS = ['Z', 'K'] as const;
+const CLIENT_VERSION = 'Z';
+type AvailableVersions = typeof AVAILABLE_VERSIONS[number];
 
-export function setPermanentWebVersion(version: typeof AVAILABLE_VERSIONS[number]) {
+function setPermanentWebVersion(version: AvailableVersions) {
   localStorage.setItem(PERMANENT_VERSION_KEY, JSON.stringify(version));
 }
+
+export function getPermanentWebVersion(): AvailableVersions | undefined {
+  const version = localStorage.getItem(PERMANENT_VERSION_KEY);
+  if (version) {
+    return JSON.parse(version);
+  }
+
+  return undefined;
+}
+
+export function switchPermanentWebVersion(version: AvailableVersions) {
+  setPermanentWebVersion(version);
+  clearWebsync();
+  getActions().skipLockOnUnload();
+  window.location.assign(`${WEB_VERSION_BASE}${version}`);
+}
+
+export function checkAndAssignPermanentWebVersion() {
+  if (window.location.hostname !== PRODUCTION_HOSTNAME) return;
+
+  const referrer = document.referrer.toLowerCase();
+  if (!SEARCH_ENGINE_REFERRERS.some((engine) => referrer.match(`(\\/\\/:|\\.)${engine}\\.`))) return;
+
+  const currentVersion = getPermanentWebVersion();
+  if (currentVersion) {
+    if (currentVersion !== CLIENT_VERSION) {
+      switchPermanentWebVersion(currentVersion);
+    }
+    return;
+  }
+
+  const urlParams = new URLSearchParams(window.location.search);
+  const hasTest = (urlParams.get('test') ?? undefined) !== undefined;
+  const shouldRedirect = Math.random() < 0.5;
+
+  if (hasTest || !shouldRedirect) {
+    setPermanentWebVersion('Z');
+    return;
+  }
+
+  switchPermanentWebVersion('K');
+}